DOI: 10.1016/j.quascirev.2018.06.006
Scopus记录号: 2-s2.0-85048743010
论文题名: Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum
作者: Schneider A. ; Panieri G. ; Lepland A. ; Consolaro C. ; Crémière A. ; Forwick M. ; Johnson J.E. ; Plaza-Faverola A. ; Sauer S. ; Knies J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 193 起始页码: 98
结束页码: 117
语种: 英语
英文关键词: Arctic Ocean
; Authigenic carbonate
; Deglaciation
; Foraminifers
; Holocene
; Methane seepage
; Micropaleontology
; Paleogeography
; Pleistocene
; Stable isotopes
Scopus关键词: Carbon
; Flow of fluids
; Glacial geology
; Isotopes
; Sea ice
; Sediments
; Seepage
; Stratigraphy
; Sulfur compounds
; Arctic ocean
; Authigenic carbonates
; Deglaciations
; Foraminifers
; Holocenes
; Methane seepages
; Micropaleontology
; Paleogeography
; Pleistocene
; Stable isotopes
; Methane
; benthic foraminifera
; carbon isotope
; carbonate
; deglaciation
; diagenesis
; geological record
; Holocene
; Last Glacial Maximum
; methane
; micropaleontology
; paleogeography
; planktonic foraminifera
; Pleistocene
; Pleistocene-Holocene boundary
; precipitation (climatology)
; seafloor
; sedimentation
; seepage
; stable isotope
; transition zone
; vertical migration
; Arctic
; Arctic Ocean
; Arctic Ocean
; Barents Sea
; Fram Strait
; Svalbard
; Svalbard and Jan Mayen
; Vestnesa Ridge
; Foraminifera
英文摘要: Multiple proxies in the geological record offshore NW Svalbard track shallow subseafloor diagenesis and seafloor methane seepage during the Last Glacial Maximum (LGM) extent and the disintegration of the Svalbard Barents Sea Ice Sheet (SBIS). Vestnesa Ridge, located at 79°N and in 1200 m water depth, is one of the northernmost known active methane seep sites and is characterised by a subseafloor fluid flow system, numerous seafloor pockmarks and gas flares in the water column. In this study, we develop a Late Pleistocene and Holocene stratigraphic framework, use stable oxygen and carbon isotope signatures (δ18O, δ13C) of benthic and planktic foraminifera, the mineralogical and carbon isotope composition of methane-derived authigenic carbonate (MDAC) and sediment geochemical data of ten sediment cores to assess methane seepage variability on Vestnesa Ridge. The studied cores cover the age range between 31.9 and 10 cal ka BP and record 32 negative δ13C excursions in benthic and planktic foraminifera with amplitudes down to −29 ‰ VPDB. These δ13C excursions are often associated with elevated Ca/Ti and Sr/Ti elemental ratios in sediments and MDAC nodules. The precipitation of MDAC overgrowth on foraminiferal tests explains most of the negative δ13C excursions. In this dataset, the oldest recorded methane emission episodes on Vestnesa Ridge occurred between the LGM (24–23.5 cal ka BP) and Heinrich Event 1 (HE 1; 17.7–16.8 cal ka BP). Geological indicators for past subseafloor methane cycling and seafloor methane seepage, such as negative foraminiferal δ13C excursions, MDAC nodules, and elevated Sr/Ti elemental ratios recorded in post-LGM sediments, possibly represent vertical migration of the sulphate-methane transition zone (SMTZ) and post-date sedimentation by up to 13.4 ka. However, it is important to note that indications of post-LGM seafloor methane seepage at Vestnesa Ridge also correspond to the established methane efflux chronology for the adjacent Barents Sea shelf, implying that glacio-isostatic adjustments and associated re-activation of pre-existing deep-seated faults after disintegration of the SBIS are likely important controlling factors on fluid migration towards the seafloor. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112129
Appears in Collections: 气候减缓与适应
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作者单位: CAGE – Centre for Arctic Gas Hydrate, Environment and Climate, UiT The Arctic University of Norway, Department of Geosciences, Tromsø, 9037, Norway; Geological Survey of Norway, Trondheim, 7491, Norway; School of Geography, Earth & Environmental Sciences, Plymouth University, Drake Circus, Plymouth, PL4 8AA, United Kingdom; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Department of Geosciences, UiT The Arctic University of Norway, Tromsø, 9037, Norway; Department of Earth Sciences, University of New Hampshire, Durham, NH, United States; Institut Français de Recherche pour l'Exploitation de la Mer (Ifremer), Department of Marine Geosciences, Plouzané, France; Department of Geology, Tallinn University of Technology, Tallinn, Estonia
Recommended Citation:
Schneider A.,Panieri G.,Lepland A.,et al. Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum[J]. Quaternary Science Reviews,2018-01-01,193